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US 6,644,875 B1Granted
Printing device
AssigneeCitizen Watch Co., Ltd.
InventorsTsuyoshi Sakaino, Makoto Kawasaki, Yoshiro Kato, Katsuhiko Sato
Life of this patent
Estimating the term…
Abstract
Before stopper members (25) of a skew correcting mechanism (10) are evacuated from a sheet conveyor path, sheet conveyor roller pairs (8) rotate a set angle in a direction opposite to the sheet feeding direction such that a sheet is separated from the stopper members (25). The sheet conveyor roller pairs (8) are arranged so that at least one of the rollers of each pair is independently pressed against the other with a force corresponding to the type of the sheet.
Claims20
A printing apparatus comprising:
- a body frame;
- a sheet carrier fixed to the body frame and having a sheet conveyor surface defining a straight sheet conveyor path;
- a platen exposed to the sheet conveyor path through the sheet conveyor surface of the sheet carrier;
- a print head opposed to the platen;
- sheet conveyor rollers arranged on the upper-stream side of the platen in the sheet feeding direction, holding a sheet from both sides, obverse and reverse, and capable of transporting the sheet;
- a skew correcting mechanism including stopper members arranged between the platen and said conveyor rollers in the feeding direction and capable of projecting above the sheet conveyor path and receding from the sheet conveyor path;
- and
- a control device including a sheet sensor, said sheet conveyor rollers being adapted to rotate a set angle in a direction opposite to the sheet feeding direction such that the sheet is separated from the stopper members of the skew correcting mechanism before the stopper members are evacuated from a sheet conveyor path.
5 more elements
A printing apparatus comprising:
- a body frame;
- a sheet carrier fixed to the body frame and having a sheet conveyor surface defining a straight sheet conveyor path;
- a platen exposed to the sheet conveyor path through the sheet conveyor surface of the sheet carrier;
- a print head opposed to the platen;
- sheet conveyor roller pairs arranged on the upper-stream side of the platen in the sheet feeding direction, holding a sheet from both sides, obverse and reverse, and capable of transporting the sheet;
- and
- stopper members for skew correction arranged between the platen and said conveyor roller pairs in the feeding direction and capable of projecting above the sheet conveyor path and receding from the sheet conveyor path,
- said sheet conveyor roller pairs including a first roller and a second roller, a plurality of pairs being arranged in the width direction of the sheet in a manner such that at least the first or second roller is plural in number, at least one of the rollers of each pair being independently pressed against the other with a predetermined force such that each roller pair holds the sheet independently of the other roller pairs and is not influenced by states of rotation of adjacent roller pairs.
5 more elements
A printing apparatus comprising:
- a body frame;
- a sheet carrier fixed to the body frame and having a sheet conveyor surface defining a straight sheet conveyor path;
- a platen exposed to the sheet conveyor path through the sheet conveyor surface of the sheet carrier;
- a print head opposed to the platen;
- a plurality of sheet conveyor roller pairs arranged on the upper-stream side of the platen in the sheet feeding direction and capable of holding a sheet from both sides, obverse and reverse, with independent forces;
- a skew correcting mechanism including stopper members arranged between the platen and said conveyor roller pairs in the feeding direction and capable of projecting above the sheet conveyor path and receding from the sheet conveyor path;
- and
- a control device including a sheet sensor, the force of said sheet conveyor roller pairs to hold the sheet being adjustable depending on the type of the sheet.
5 more elements
Dependencies are inferred from the claim text.